Bring a pan of salted water to the boil and cook the Jerusalem artichokes for 6-8 minutes until just tender. Drain well.
Meanwhile, prepare the breadcrumbs. Heat half of the butter and oil in a small frying pan and gently fry the crumbs for 2-3 minutes until crisp and golden. Remove from the pan and reserve.
Return the frying pan to the heat and add the remaining butter and oil. Sauté the Jerusalem artichokes over a medium heat for 3-4 minutes until golden. Season to taste.
Spoon the Jerusalem artichokes out into a serving bowl. Scatter the crispy golden crumbs and parsley over and drizzle with the hazelnut oil.
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